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Mon, 19 Feb 2024 12:06:43 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.11.0-alpha0-144-ge5821d614e-fm-20240125.002-ge5821d61 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: In-Reply-To: References: <20240206074552.541154-1-maskray@google.com> Date: Mon, 19 Feb 2024 18:06:19 +0100 From: "Arnd Bergmann" To: "Ard Biesheuvel" , "Geert Uytterhoeven" Cc: "Fangrui Song" , "Catalin Marinas" , "Will Deacon" , linux-arm-kernel@lists.infradead.org, "Jisheng Zhang" , "Dave Martin" , "Peter Smith" , llvm@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] arm64: jump_label: use constraints "Si" instead of "i" Content-Type: text/plain;charset=utf-8 Content-Transfer-Encoding: quoted-printable On Mon, Feb 19, 2024, at 16:41, Ard Biesheuvel wrote: > On Mon, 19 Feb 2024 at 15:43, Geert Uytterhoeven wrote: >> On Mon, Feb 19, 2024 at 11:57=E2=80=AFAM Ard Biesheuvel wrote: >> > On Mon, 19 Feb 2024 at 11:56, Ard Biesheuvel wrot= e: >> > https://godbolt.org/z/GTnf3vPaT >> >> I could reproduce the issue on v6.8-rc5 using arm64 defconfig >> and x86_64-gcc-5.5.0-nolibc-aarch64-linux.tar.xz from >> https://cdn.kernel.org/pub/tools/crosstool/files/bin/x86_64/5.5.0/: >> > > OK, I managed to do so as well. > > And GCC 6.4 from the same source works correctly. > > Not sure whether there are any plans to bump the minimal GCC version > any time soon (cc'ing Arnd), but we should probably drop this change > until that happens. >From what I can tell, we may as well formally raise the minimum gcc version to 8.1+ already, as that is a version that is actually used in distros, and we have been on 5.1+ for a few years already. Not sure if there are any other benefits to gcc-8 besides allowing minor cleanups. gcc-9 would bring --std=3Dgnu2x support, but it may be too early for that. Arnd